Experimental Study on Evolution Law of Surrounding Rock Fissures in Roadway of Binhu Coal Mine

To explore the space-time evolution law of surrounding rock fissures in deep roadway during roadway excavation, the 16112 material roadway of Binhu Coal Mine was taken as the engineering background, and ZKXG30 borehole imager was used to carry out the drilling detection for roadway roof and sides coal and rock mass during the roadway excavation process. Through the quantitative analysis of the distribution characteristics of the coal-rock structure surface of the roof drilling, and the evaluation of the roof fracture at different locations, the spatio-temporal evolution law of surrounding rock fissures of 16# coal seam roadway is obtained. The results show that with the roadway excavation, the surrounding rock loose circle shows a development trend of early expansion and later contraction. After the excavation, the loose circle of the surrounding rock expands from 0 to 250 m, and the loose circle of 250 m expands to the maximum; the loose circle from 250 to 650 m gradually shrinks, and the loose circle of 650 m reaches stability.